Diaphragm-pump



W. E. DUNKLE.

DIAPHRAGM PUMP.

APPLICATION FILED M023, 1919.

1 {389,685 9 Patentefl Sept. 6, 1921.

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ENVENTOR entree s'rarss west-m. E. numrma, or common, NEVADA.

DIAPHRAGM-YUM.

specification of Letters Patent.

Patented-Sept. s, 1921.

Application filed December 23,1919. Serial No. 346,862.

To all whom it may concern:

Be it known that I, WESLEY E. Domuls, a citizen of the United States,and resident of Contact, in the county of Elko and State of Nevada, haveinvented a new and useful Improvement in Diaphragm-Pumps; and I dohereby declare the following to be a full, clear, and exact descriptionthereof.

My invention relates to diaphragm pumps, and it has for its object toprovide a pump of the character indicated in which. communicationbetween the interior of the pump and the outer air is effectivelyprovided, in which an annular diaphragm is alternately distended andcollapsed by forcing fluid into and out of the diaphragm and in whichthese results are produced by a simple and effective arrangement ofparts.

In the accompanying drawing, Figure 1 is a vertical sectional viewshowing a pump constructed in accordance with my invention with thepiston at the limit of its outward movement; Fig. 2 is a verticalsectional view similar to Fig. 1 showing the piston at the 3 limit ofits inward movement Fi 3 is a.

transverse sectional view of the same structure, the section being takensubstantially along the line 3-3, Fig. 1; and Fig.4 isa verticalsectional view showing a modified form of plunger and diaphragmconstrucnon.

Referring first to Figs. 1 and 2 of the drawing, the pump therein showncomprises a cylinder or casing 2 provided with suitable valved inlet andoutlet connections 3 and 42. The cover 5 of the cylinder 2 is providedwith a central circular opening around which is disposed a tubularmember 6 that extends into the casing and is provided with smallperforations 7 upon its side walls and upon its closed inner end. Ahollow plunger 8 provided with the usual expansive piston rings 9, isadapted to reciprocate within the tubular member 6 and is attached atits outer end to a cross-head 10.

Surrounding the tubular. member 6 is an annular diaphragm 11 of rubberor other flexible sheet material, the open end of which is securelyattached by means of a band 12 or otherwise to the tubular member (5near the cover 5. A second annular diaphragm 13 surrounds the plunger 8outside of the casing 12, and has its ends attached, respectively, tothe casing and to the plunger by means of bands 14: and 15.

The plunger 8 and the perforated tubular member 6 are filled with aliquid preferably an oil which is not injurious to the rubber or othermaterial of which the diaphragms ll and-13 are composed. The amount ofliquid is preferably such that when the plunger is withdrawn to thelimit of its outward movement, as. shown in Fig. 1, the diaphragm 11will not quite touch the tubular member 6.: The reciprocation ot'v theplunger 8 causes a small amount of oil to work up outside of the plungerand enter the space ,between the plunger and the outside diaphragm 13,and in order to permit such oil to reenter the plunger on the suctionstroke of the pump, I provide suitable check valves 16 and 17 in theplunger. The holes leading to these check valves are so small that therubber diaphragm 13 will not be drawn into them. Th diaphragm may, ifdesired, be made with an insertion of cloth or other non-elastic sheetmaterial opposite the valve ports, in order to prevent stretching andrubbing of the diaphragm at this point.

The modified device shown in Fig. 4. is similar in its generalconstruction to the pump shown in Figs. 1, 2 and 3 and the correspondingparts are correspondingly numbored. In the device of Fig. 4, however,the tubular member'fi'is omitted and the plunger 8 reciprooates withinan annular bearing 20 formed on or attached to the cover 5 of the casing2, and extending either into the casing or above it, as desired. Theplunger is provided with an inwardly extending portion 21 havinglateral.perforations 22 and having its inner end closed, as shown at 23.An annular diaphragm 24 surrounds the inner portion 21 of the lunger andhas its ends attached respective y to the bearing 20 and to the innerend of the plunger by means of bands 25 and 26.

The operation or my diaphragm pump will be evident fro-tn an inspectionof Figs.

1 and 2. When the plun or is moved into the cylinder, as shown in ig. 2,oil is forced through the perforations 7 and distends the diaphragm 11,thereby forcing the liquid that is being pumped through the outlet con-7 except such as nection 4:. When the plunger is withdrawn the casing iseffected by the plunger itself,

and not by the simple distention oi the inner diaphragm.

If it should happen that pumping conditions are such as to produce agreater pressure on the upper diaphragm than on the lower diaphragm, theoil in the upper space may eventually be forced past the plunger 1 intothe lower space, which would leave the upper part of the plunger withoutlubrication. It may therefore be desirable to provide anothercheck-valve 80 below the valves 1617 at a point that will come abovetheupper, edge of the casing at an intermediate point in the stroke, and toset this lower check valve to open on the pulsion stroke, so as toinsure a circulation of oil. The port to this valve should be of lesscapacity than the ports draining the upper space through the valvesl6l7.

My diaphragm pump is of special advantage in pumping liquids which arecorrosive or gritty and which give off poisonous or otherwise injuriousfumes which mi ht leak through ordinary pump packing. aching frictionand air leakage at the gland is entirely eliminated in my device and theefiioiency of the pump is thereby increased.

While I have herein shown certain preferred embodiments of my invention,it is obvious that numerous changes in the construction and arrangementof parts may be made without departing from the pri ciples of myinvention. I, therefore, desire hat no limitations be imposed on inve'areindicated in the appended claims.

What I claim is:

1. A pump comprising a reciprocahle plunger and a tubular, radiallydistensible working diaphragm surrounding the said plunger.

pump comprising a reciprocable plunger, a bearing therefor, and atubular, radially distensible working diaphragm surrounding the saidplunger.

3. A pump comprising a casing, a tubular diaphragm disposed therein, andmeans for intermittently and radially distending the diaphragm byforcing fluid thereinto. A pump comprising a casing, a plunger adaptedto enter the said casing, and a fiexible radially distensible-Worlringdiaphragm surrounding the said plunger within the said casin 5. .1 pumpcomprising a casing, a hollow fluid-filled plunger adapted to enter thesaid.

said "casing arid adapted to be distended whenthe said plunger movesinto the said casi 6. pump comprising a casing, a plunger adapted toenter the said casing, and a lienihle radially distensible diaphragmsurrounding the said plunger within-the said casing, the said diaphra mhavingone of its ends attached to the sai casing.

7. A pump comprising a casing, a plunger adapted to enter the saidcasing, a flexible diaphragm disposed within the said casing andsurrounding the said plunger, and a second flexible diaphragmsurrounding the said plunger outside of the said casing.

S. A pump comprising a casing, a hollow,

liquid-filled plunger adapted to enter the said casing, a flexiblediaphragm disposed within the said casing and surrounding the saidplunger, a second flexible diaphragm surrounding the said plungeroutside of the said casing and a cheek-valve in the said plungerpermitting the entrance of liquid into the said plunger from the spaceinelcsed by the said outside diaphragm.

9. A pump comprising a casing, a plunger adapted to enter the saidcasing, and'a tubular' flexible diaphragm surrounding the said plungerwithin the said casing, the said diaphragm having one of its endsattached to the said casing and having its other end closed.

10. A pump-comprisin a casing, a periorated tubular member isposedtherein, a plunger adapted to enter the said tubular member, and aflexible diaphragm surrounding the said tubular member.

11. A pump comprising a. casing, a perforated tubular member disposedtherein, a liquid-filled plunger adapted to enter the said tuhuiarzuember, and a flexible diaphragm surrounding the said tubular memberand adapted to be distended by-liquid forced by the said plunger throughthe perforations of: the said tubular member.

32. A pump comprising a casingf'a tubu- -lar member extending into thesaid casing surrounding the said tubular member,'the

said diaphragm havin one of its ends attached to the said tubular memberand having its other end closed to surround the closed end 01': the saidtubular member.

13. A pump comprising a casing, a tubular member extending into'the saidcasing and provided with a closed inner end and with perforations formedin its side and end walls, a hollow liquid-filled plun er adapted toreciprocate within the said tu ularmemher, a fielvible diaphragmsurrounding the said tubular member, the said diaphragm having one ofits ends attached to the said tubular member and having its other endliquid into the said plunger from the space closed to surround theclosed end of the inclosed by the said outside diaphragm. 10 saidtubular member, a second flexible In testimony whereof, I, the saidWESLEY diaphragm surrounding the said plunger E. DUNKLE, have hereuntoset my hand.

outside of the said casing, and having its WESLEY E. DUNKLE. endssecured respectively, to the said casing Witnesses:

and to the said plunger and a check-valve in FLORENCE H. DUNKLE,

the said plunger permitting the entrance of W. A. KENT.

